In the pipeline proposed by [1]}, the pool of retrieved documents provided by the method of [2]} in the form of a term matrix and a simple inverted index lookup.
This pool is fixed so that the results are comparable to their experiments with human annotators.
This part could however also be automated and replaced by a more advanced model which could be finetuned.
The artefact in this pipeline is the weighted average of retrieved documents based on the dot product between the encoded representation and the encoded topic.
